According to Voltaire, being doubtful about something is not pleasing but being certain about something is preposterous.

By being uncertain about something, a person is able to ensure its validity and reliability. For example, if a pupil is not able to understand something in class, they can clear their doubt by receiving help from a teacher. However, if the student misunderstands a topic and is certain that they have understood it, they may risk failing an exam.

Similarly, scientists cannot be certain about anything. Even though they have the best equipment and apparatus, human error is possible. Therefore, it is important to be open-minded and think about any possible errors. By repeating an experiment, we ensure that our method is valid and the results obtained are reliable. Other than this, our experiment should be reviewed by others to ensure that our results are reproducible.

However, certainty is not absurd in many cases. For example, if we throw something towards the sky, it is certain that it will fall back down due to gravity. There is a boundary between being certain and being unreasonable. Certainty allows us to be confident in our actions. Edward Jenner was certain that exposure to cowpox can help to build immunity against smallpox. This led to the discovery of vaccines and Jenner is often called “the father of immunology”.

It is good to have doubts first in order to be certain about something later. However, stating that “certainty is absurd” is too strong. Scientists must ensure that they clear any doubts or uncertainties before proclaiming something. However, it is okay to be certain about common things such as the Earth is round and orbits around the sun.